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Command Objects

Command Objects¶

class Cake\Console\Command¶

CakePHP comes with a number of built-in commands for speeding up your development, and automating routine tasks. You can use these same libraries to create commands for your application and plugins.

Creating a Command¶

Let’s create our first Command. For this example, we’ll create a simple Hello world command. In your application’s src/Command directory create HelloCommand.php. Put the following code inside it:

<?php
namespace App\Command;

use Cake\Command\Command;
use Cake\Console\Arguments;
use Cake\Console\ConsoleIo;

class HelloCommand extends Command
{
    public function execute(Arguments $args, ConsoleIo $io): int
    {
        $io->out('Hello world.');

        return static::CODE_SUCCESS;
    }
}

Command classes must implement an execute() method that does the bulk of their work. This method is called when a command is invoked. Lets call our first command application directory, run:

bin/cake hello

You should see the following output:

Hello world.

Our execute() method isn’t very interesting let’s read some input from the command line:

<?php
namespace App\Command;

use Cake\Command\Command;
use Cake\Console\Arguments;
use Cake\Console\ConsoleIo;
use Cake\Console\ConsoleOptionParser;

class HelloCommand extends Command
{
    protected function buildOptionParser(ConsoleOptionParser $parser): ConsoleOptionParser
    {
        $parser->addArgument('name', [
            'help' => 'What is your name',
        ]);

        return $parser;
    }

    public function execute(Arguments $args, ConsoleIo $io): int
    {
        $name = $args->getArgument('name');
        $io->out("Hello {$name}.");

        return static::CODE_SUCCESS;
    }
}

After saving this file, you should be able to run the following command:

bin/cake hello jillian

# Outputs
Hello jillian

Changing the Default Command Name¶

CakePHP will use conventions to generate the name your commands use on the command line. If you want to overwrite the generated name implement the defaultName() method in your command:

public static function defaultName(): string
{
    return 'oh_hi';
}

The above would make our HelloCommand accessible by cake oh_hi instead of cake hello.

Defining Arguments and Options¶

As we saw in the last example, we can use the buildOptionParser() hook method to define arguments. We can also define options. For example, we could add a yell option to our HelloCommand:

// ...
protected function buildOptionParser(ConsoleOptionParser $parser): ConsoleOptionParser
{
    $parser
        ->addArgument('name', [
            'help' => 'What is your name',
        ])
        ->addOption('yell', [
            'help' => 'Shout the name',
            'boolean' => true,
        ]);

    return $parser;
}

public function execute(Arguments $args, ConsoleIo $io): int
{
    $name = $args->getArgument('name');
    if ($args->getOption('yell')) {
        $name = mb_strtoupper($name);
    }
    $io->out("Hello {$name}.");

    return static::CODE_SUCCESS;
}

See the Option Parsers section for more information.

Creating Output¶

Commands are provided a ConsoleIo instance when executed. This object allows you to interact with stdout, stderr and create files. See the Command Input/Output section for more information.

Using Models in Commands¶

You’ll often need access to your application’s business logic in console commands. You can load models in commands, just as you would in a controller using $this->fetchTable() since command use the LocatorAwareTrait:

<?php
declare(strict_types=1);

namespace App\Command;

use Cake\Command\Command;
use Cake\Console\Arguments;
use Cake\Console\ConsoleIo;
use Cake\Console\ConsoleOptionParser;

class UserCommand extends Command
{
    // Define the default table. This allows you to use `fetchTable()` without any argument.
    protected $defaultTable = 'Users';

    protected function buildOptionParser(ConsoleOptionParser $parser): ConsoleOptionParser
    {
        $parser
            ->addArgument('name', [
                'help' => 'What is your name'
            ]);

        return $parser;
    }

    public function execute(Arguments $args, ConsoleIo $io): int
    {
        $name = $args->getArgument('name');
        $user = $this->fetchTable()->findByUsername($name)->first();

        $io->out(print_r($user, true));

        return static::CODE_SUCCESS;
    }
}

The above command, will fetch a user by username and display the information stored in the database.

Exit Codes and Stopping Execution¶

When your commands hit an unrecoverable error you can use the abort() method to terminate execution:

// ...
public function execute(Arguments $args, ConsoleIo $io): int
{
    $name = $args->getArgument('name');
    if (strlen($name) < 5) {
        // Halt execution, output to stderr, and set exit code to 1
        $io->error('Name must be at least 4 characters long.');
        $this->abort();
    }

    return static::CODE_SUCCESS;
}

You can also use abort() on the $io object to emit a message and code:

public function execute(Arguments $args, ConsoleIo $io): int
{
    $name = $args->getArgument('name');
    if (strlen($name) < 5) {
        // Halt execution, output to stderr, and set exit code to 99
        $io->abort('Name must be at least 4 characters long.', 99);
    }

    return static::CODE_SUCCESS;
}

You can pass any desired exit code into abort().

Tip

Avoid exit codes 64 - 78, as they have specific meanings described by sysexits.h. Avoid exit codes above 127, as these are used to indicate process exit by signal, such as SIGKILL or SIGSEGV.

You can read more about conventional exit codes in the sysexit manual page on most Unix systems (man sysexits), or the System Error Codes help page in Windows.

Calling other Commands¶

You may need to call other commands from your command. You can use executeCommand to do that:

// You can pass an array of CLI options and arguments.
$this->executeCommand(OtherCommand::class, ['--verbose', 'deploy']);

// Can pass an instance of the command if it has constructor args
$command = new OtherCommand($otherArgs);
$this->executeCommand($command, ['--verbose', 'deploy']);

Note

When calling executeCommand() in a loop, it is recommended to pass in the parent command’s ConsoleIo instance as the optional 3rd argument to avoid a potential “open files” limit that could occur in some environments.

Setting Command Description¶

You may want to set a command description via:

class UserCommand extends Command
{
    public static function getDescription(): string
    {
        return 'My custom description';
    }
}

This will show your description in the Cake CLI:

bin/cake

App:
  - user
  └─── My custom description

As well as in the help section of your command:

cake user --help
My custom description

Usage:
cake user [-h] [-q] [-v]

Testing Commands¶

To make testing console applications easier, CakePHP comes with a ConsoleIntegrationTestTrait trait that can be used to test console applications and assert against their results.

To get started testing your console application, create a test case that uses the Cake\TestSuite\ConsoleIntegrationTestTrait trait. This trait contains a method exec() that is used to execute your command. You can pass the same string you would use in the CLI to this method.

Let’s start with a very simple command, located in src/Command/UpdateTableCommand.php:

namespace App\Command;

use Cake\Command\Command;
use Cake\Console\Arguments;
use Cake\Console\ConsoleIo;
use Cake\Console\ConsoleOptionParser;

class UpdateTableCommand extends Command
{
    protected function buildOptionParser(ConsoleOptionParser $parser): ConsoleOptionParser
    {
        $parser->setDescription('My cool console app');

        return $parser;
    }
}

To write an integration test for this command, we would create a test case in tests/TestCase/Command/UpdateTableTest.php that uses the Cake\TestSuite\ConsoleIntegrationTestTrait trait. This command doesn’t do much at the moment, but let’s just test that our command’s description is displayed in stdout:

namespace App\Test\TestCase\Command;

use Cake\TestSuite\ConsoleIntegrationTestTrait;
use Cake\TestSuite\TestCase;

class UpdateTableCommandTest extends TestCase
{
    use ConsoleIntegrationTestTrait;

    public function testDescriptionOutput()
    {
        $this->exec('update_table --help');
        $this->assertOutputContains('My cool console app');
    }
}

Our test passes! While this is very trivial example, it shows that creating an integration test case for console applications can follow command line conventions. Let’s continue by adding more logic to our command:

namespace App\Command;

use Cake\Command\Command;
use Cake\Console\Arguments;
use Cake\Console\ConsoleIo;
use Cake\Console\ConsoleOptionParser;
use Cake\I18n\DateTime;

class UpdateTableCommand extends Command
{
    protected function buildOptionParser(ConsoleOptionParser $parser): ConsoleOptionParser
    {
        $parser
            ->setDescription('My cool console app')
            ->addArgument('table', [
                'help' => 'Table to update',
                'required' => true
            ]);

        return $parser;
    }

    public function execute(Arguments $args, ConsoleIo $io): int
    {
        $table = $args->getArgument('table');
        $this->fetchTable($table)->updateQuery()
            ->set([
                'modified' => new DateTime()
            ])
            ->execute();

        return static::CODE_SUCCESS;
    }
}

This is a more complete command that has required options and relevant logic. Modify your test case to the following snippet of code:

namespace Cake\Test\TestCase\Command;

use Cake\Command\Command;
use Cake\I18n\DateTime;
use Cake\TestSuite\ConsoleIntegrationTestTrait;
use Cake\TestSuite\TestCase;

class UpdateTableCommandTest extends TestCase
{
    use ConsoleIntegrationTestTrait;

    protected $fixtures = [
        // assumes you have a UsersFixture
        'app.Users',
    ];

    public function testDescriptionOutput()
    {
        $this->exec('update_table --help');
        $this->assertOutputContains('My cool console app');
    }

    public function testUpdateModified()
    {
        $now = new DateTime('2017-01-01 00:00:00');
        DateTime::setTestNow($now);

        $this->loadFixtures('Users');

        $this->exec('update_table Users');
        $this->assertExitCode(Command::CODE_SUCCESS);

        $user = $this->getTableLocator()->get('Users')->get(1);
        $this->assertSame($user->modified->timestamp, $now->timestamp);

        DateTime::setTestNow(null);
    }
}

As you can see from the testUpdateModified method, we are testing that our command updates the table that we are passing as the first argument. First, we assert that the command exited with the proper status code, 0. Then we check that our command did its work, that is, updated the table we provided and set the modified column to the current time.

Remember, exec() will take the same string you type into your CLI, so you can include options and arguments in your command string.

Testing Interactive Commands¶

Consoles are often interactive. Testing interactive commands with the Cake\TestSuite\ConsoleIntegrationTestTrait trait only requires passing the inputs you expect as the second parameter of exec(). They should be included as an array in the order that you expect them.

Continuing with our example command, let’s add an interactive confirmation. Update the command class to the following:

namespace App\Command;

use Cake\Command\Command;
use Cake\Console\Arguments;
use Cake\Console\ConsoleIo;
use Cake\Console\ConsoleOptionParser;
use Cake\I18n\DateTime;

class UpdateTableCommand extends Command
{
    protected function buildOptionParser(ConsoleOptionParser $parser): ConsoleOptionParser
    {
        $parser
            ->setDescription('My cool console app')
            ->addArgument('table', [
                'help' => 'Table to update',
                'required' => true
            ]);

        return $parser;
    }

    public function execute(Arguments $args, ConsoleIo $io): int
    {
        $table = $args->getArgument('table');
        if ($io->ask('Are you sure?', 'n', ['y', 'n']) !== 'y') {
            $io->error('You need to be sure.');
            $this->abort();
        }
        $this->fetchTable($table)->updateQuery()
            ->set([
                'modified' => new DateTime()
            ])
            ->execute();

        return static::CODE_SUCCESS;
    }
}

Now that we have an interactive command, we can add a test case that tests that we receive the proper response, and one that tests that we receive an incorrect response. Remove the testUpdateModified method and, add the following methods to tests/TestCase/Command/UpdateTableCommandTest.php:

public function testUpdateModifiedSure()
{
    $now = new DateTime('2017-01-01 00:00:00');
    DateTime::setTestNow($now);

    $this->loadFixtures('Users');

    $this->exec('update_table Users', ['y']);
    $this->assertExitCode(Command::CODE_SUCCESS);

    $user = $this->getTableLocator()->get('Users')->get(1);
    $this->assertSame($user->modified->timestamp, $now->timestamp);

    DateTime::setTestNow(null);
}

public function testUpdateModifiedUnsure()
{
    $user = $this->getTableLocator()->get('Users')->get(1);
    $original = $user->modified->timestamp;

    $this->exec('my_console best_framework', ['n']);
    $this->assertExitCode(Command::CODE_ERROR);
    $this->assertErrorContains('You need to be sure.');

    $user = $this->getTableLocator()->get('Users')->get(1);
    $this->assertSame($original, $user->timestamp);
}

In the first test case, we confirm the question, and records are updated. In the second test we don’t confirm and records are not updated, and we can check that our error message was written to stderr.

Assertion methods¶

The Cake\TestSuite\ConsoleIntegrationTestTrait trait provides a number of assertion methods that make help assert against console output:

// assert that the command exited as success
$this->assertExitSuccess();

// assert that the command exited as an error
$this->assertExitError();

// assert that the command exited with the expected code
$this->assertExitCode($expected);

// assert that stdout contains a string
$this->assertOutputContains($expected);

// assert that stderr contains a string
$this->assertErrorContains($expected);

// assert that stdout matches a regular expression
$this->assertOutputRegExp($expected);

// assert that stderr matches a regular expression
$this->assertErrorRegExp($expected);

Debug Helpers¶

You can use debugOutput() to output the exit code, stdout and stderr of the last run command:

$this->exec('update_table Users');
$this->assertExitCode(Command::CODE_SUCCESS);
$this->debugOutput();

Added in version 4.2.0: The debugOutput() method was added.

Lifecycle Callbacks¶

Like Controllers, Commands offer lifecycle events that allow you to observe the framework calling your application code. Commands have:

Command.beforeExecute Is called before a command’s execute() method is. The event is passed the ConsoleArguments parameter as args. This event cannot be stopped or have its result replaced.
Command.afterExecute Is called after a command’s execute() method is complete. The event contains ConsoleArguments as args and the command result as result. This event cannot be stopped or have its result replaced.

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